Intelligence is a relative concept. When it comes to intelligence tests, Wechsler stated his belief that they are valid and useful and that a competent examiner can do much better at evaluating intelligence with them than without them. In the case of intelligence tests, the behavior samples are relevant to cognitive abilities of one sort or another and these abilities, in turn, have a very significant impact in various life outcomes, such as educational and occupational success. In a sense, nearly all of human behavior involves cognitive abilities as these encompass processes that include attention, perception, comprehension, judgment, decision making, reasoning, intuition, and memory, among others. Not all of these are tapped by intelligence tests. However, it also seems clear that not all intelligent behavior is simply a function of the cognitive abilities measured by the tests.